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Mean sea level (MSL, often shortened to sea level) is an average surface level of one or more among Earth's coastal bodies of water from which heights such as elevation may be measured.
View regional relative sea level trends and understand the processes that contribute to the measurements from satellite altimeters and tide gauges.
Oct 19, 2023 · Sea level is the base level for measuring elevation and depth on Earth. Because the ocean is one continuous body of water, its surface tends to seek the same level throughout the world. However, winds, currents, river discharges, and variations in gravity and temperature prevent the sea surface from being truly level.
Sea level rise is caused primarily by two factors related to global warming: the added water from melting ice sheets and glaciers, and the expansion of seawater as it warms. The first graph tracks the change in global sea level since 1993, as observed by satellites.
The NASA Sea Level Projection Tool allows users to visualize and download the sea level projection data from the IPCC 6th Assessment Report (AR6). The goal of this tool is to provide easy and improved access and visualization to the consensus projections found in the report.
Chart the changes in Earth’s water and ice that most clearly reveal global sea level rise. Learn more about the different causes of sea level change and the scientific background of observations and projecting sea level.
Yes, sea level is rising at an increasing rate. With continued ocean and atmospheric warming, sea levels will likely rise for many centuries at rates higher than that of the current century.
Mar 21, 2024 · Global average sea level rose by about 0.3 inches (0.76 centimeters) from 2022 to 2023, a relatively large jump due mostly to a warming climate and the development of a strong El Niño. The total rise is equivalent to draining a quarter of Lake Superior into the ocean over the course of a year.
Jun 3, 2024 · sea level, position of the air-sea interface, to which all terrestrial elevations and submarine depths are referred. The sea level constantly changes at every locality with the changes in tides, atmospheric pressure, and wind conditions.
Aug 10, 2017 · Sea level data and tidal information establish marine boundaries, from private property lines to the borders of our nation’s territorial sea. NOAA uses sea level data to produce nautical charts and promote safe navigation.
